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Best Price Iron Gate Rock Wool Infilling Soundproof Steel Door on China WDMA Built-in Blinds A: Each warranty period beginsBest Price Iron Gate Rock Wool Infilling Soundproof Steel Door Click here for more information Product Description Name Description Security Steel door Leaf 0. 5mm 1. 0mm cold rolled steel panel (Exterior door) frame 0. 8mm 2. 0mm cold rolled steel panel Security Steel Door Advantages Raw material Phosphatized treatment, stable performance, long lasting Infilling Honeycomb paper: Heat Insulation Rock wool: Fireproof, Heat Insulation Fireproof Board: